Bucking historical trends, all but McHenry County in the Chicago suburbs went for Hillary Clinton.

The Democratic Party of DuPage got a sudden influx of young foot soldiers, like organizer Alex Franklin, who campaigned for charismatic Democrat Bernie Sanders until the Vermont senator conceded to Clinton in July, then went to work for Clinton. Clinton won DuPage County by 14 percentage points on Tuesday.

“If you look at the holes right now, even where Democrats lost in DuPage there were absurdly high numbers, which are a direct result of the Sanders people and what we were doing out here,” said Franklin, of Glen Ellyn. He sees the merger of Clinton and Sanders supporters as the beginning of a beautiful friendship that will spill over into spring municipal elections…

This year, support for local candidates by minorities down ballot helped Clinton at the top of the ticket, experts said…

Shunning the New York billionaire might have cost Illinois Republicans down ballot, said Mark Fratella, a Trump delegate and Addison Township GOP organizer.

A variety of explanations. Yet, one is ignored here: the Chicago suburbs have experienced a lot of demographic change in recent decades: more non-white residents, more immigrants moving directly to the suburbs (rather than to neighborhoods of Chicago first), more lower and working-class residents. In other words, the images of Lake County and the North Shore or DuPage County as looking like Lake Forest, Highland Park, Hinsdale, Elmhurst, and Wheaton (all white and wealthy) simply do not hold.

A great graphic shows the change over time in recent elections:

The trends are clearly away from Republicans in the collar counties.

See earlier posts about presidential candidates fighting over the suburban vote here and here.